电子废弃塑料改性沥青流变特性及其混合料性能研究

Rheological Properties of E-Waste Plastics(EWP)Modified Asphalt and Its Mixture Performance

目前,电子废弃物的无害化处理和资源化利用正变得愈加紧迫,而将其作为原材料循环利用于土木基建工程中,是一条可行之道。因此,考虑利用电子废弃物中的塑料组分,即电子废弃塑料(e-waste plastics),对道路石油沥青进行改性。设计不同的掺量,在合适工艺下,制备得到电子废弃塑料改性沥青,并分别研究电子废弃塑料改性沥青的三大指标、存储稳定性和流变性能,以及其沥青混合料的力学性能(动态模量和相位角)、抗车辙性能和抗疲劳性能。结果表明,电子废弃塑料改性沥青的高温流变(抗车辙)性能和高温失败温度明显优于普通基质沥青。普通沥青混合料和电子废弃塑料改性沥青混合料的动态模量均随着加载频率的增加而减小,而其相位角的变化趋势则正好相反。同时,电子废弃塑料改性沥青混合料相较于普通沥青混合料,具有更优越的抗车辙性能和抗疲劳性能。

At present,the harmless treatment and resource utilization of e-waste are becoming increasingly urgent,and the recycling of e-waste as raw materials in the field of civil infrastructure engineering is a feasible way.Therefore,the E-Waste Plastics(EWP)was proposed to be used for the modification of road asphalt in this study.The EWP modified asphalt was prepared with different dosages using the appropriate process.On the one hand,the penetration,softening point,ductility,storage stability,and rheological properties of the EWP modified asphalts were investigated.On the other hand,the mechanical properties(i.e.,dynamic modulus and phase angle),rutting resistance,and fatigue resistance of the corresponding asphalt mixtures were also studied.The results showed that the high-temperature rheological(rutting resistance)performance and high-temperature failure temperature of electronic waste plastic modified asphalt were significantly better than those of ordinary matrix asphalt.The dynamic modulus of ordinary asphalt mixture and electronic waste plastic modified asphalt mixture decreased with the increase of loading frequency,while the change trend of its phase angle was opposite.At the same time,compared with ordinary asphalt mixture,electronic waste plastic modified asphalt mixture had better anti-rutting performance and anti-fatigue performance.